Epoxy/clay nanodielectrics: from relaxation dynamics to capacitive energy storage

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Advanced Composites and Hybrid Materials Pub Date : 2024-07-03 DOI:10.1007/s42114-024-00924-4

Stavros X. Drakopoulos, Konstantinos Loukelis, Marios E. Triantafyllou-Rundell, Constantinos C. Stoumpos, Maria Chatzinikolaidou, Georgios C. Psarras

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Abstract

Nanodielectric systems based on a high glass-to-rubber transition temperature (T_g) epoxy resin modified with laponite® (Na⁺_0.7[(Si₈Mg_5.5Li_0.3)O₂₀(OH)₄]^–0.7) cylindrical nanoparticles were developed and examined as dielectric materials for capacitive energy storage applications. Laponite is an inexpensive synthetic nanoclay that has recently gathered attention as potent electrode material for batteries, due to its high specific surface area and ionic groups. The dielectric properties of the developed nanocomposites were investigated extensively by means of broadband dielectric spectroscopy (BDS), which revealed intense Maxwell–Wagner-Sillars interfacial polarisation (MWS-IP) phenomena at the organic/inorganic interface and an additional dielectric process that showed a strong dependence on the nanoclay concentration, thus attributed to laponite (IDE). It was also found that the presence of laponite significantly altered the temperature dependence of MWS-IP, leading to an enhancement in relaxation times at higher temperatures. The observed phenomenon is attributed to less mobile, adsorbed polymer fragments entrapped between two or more laponite nanoparticles that alters the interphase between the particle and the epoxy. MWS-IP was observed to obey the Barton-Nakajima-Namikawa relation with the dc conductivity values being indicative that both phenomena are associated with the same charge carriers, at different timescales. Moreover, the cycle life performance of epoxy/laponite nanodielectrics was also examined at 30 °C and 120 °C conducting charge/discharge measurements in dc conditions. The addition of laponite nanoparticles endowed the nanodielectric systems with significantly improved capacitive energy efficacy.

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环氧树脂/粘土纳米电介质：从弛豫动力学到电容储能

作为电容式储能应用的电介质材料，我们开发并研究了基于高玻璃-橡胶转变温度（Tg）环氧树脂的纳米电介质系统，该系统由改性了青金石®（Na+0.7[(Si8Mg5.5Li0.3)O20(OH)4]-0.7）的圆柱形纳米颗粒组成。皂石是一种廉价的合成纳米粘土，由于其具有高比表面积和离子基团，最近作为电池的有效电极材料受到关注。研究人员通过宽带介电光谱（BDS）对所开发的纳米复合材料的介电性能进行了广泛研究，发现有机/无机界面上存在强烈的麦克斯韦尔-瓦格纳-西拉斯界面极化（MWS-IP）现象，以及与纳米粘土浓度密切相关的额外介电过程，因此将其归因于青金石（IDE）。研究还发现，青金石的存在极大地改变了 MWS-IP 的温度依赖性，导致在较高温度下弛豫时间延长。观察到的这一现象归因于两个或更多的青金石纳米颗粒之间夹杂着流动性较差的吸附聚合物片段，从而改变了颗粒与环氧树脂之间的相位。据观察，MWS-IP 遵循巴顿-中岛-南川关系，其直流电导值表明这两种现象都与相同的电荷载体有关，但时间尺度不同。此外，环氧树脂/皂石纳米电介质的循环寿命性能也在 30 °C 和 120 °C 的直流条件下进行了充放电测量。添加了青金石纳米颗粒的纳米介电系统的电容能效显著提高。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.